MSI-P442 Rev.0 USER MANUAL - Microcomputer Systems, Inc.
Contents
1. D7 MSB D6 DS D4 D3 D2 Di DO LSB PD1 PDO ACOMOD RNG BIP A2 Al AO where PD1 PDO select the clock and power down mode Table 4 ACQMOD 0 internally controlled acquisition 1 externally controlled acquisition RNG selects the full scale voltage range Table 5 BIP selects unipolar or bipolar conversion mode Table 5 A2 A1 AO select the desired input channel 0 7 of the MAX197 The card is designed to operate using the internal clock with PD1 0 and PDO 1 in normal operation The internally controlled acquisition ACQMOD 0 is nor mally used Table 4 Clock and Power Down Selection PD1 PDO DEVICE MODE Normal Operation External Clock Mode Normal Operation Internal Clock Mode Standby Power down STBYPD clock unaffected Full Power down FULLPD clock unaffected e e O 0 1 0 1 Page 9 MSI P442 User Manual Table 5 Range and Polarity Selection BIP RNG INPUT RANGE V 0 0 0to5 0 1 0 to 10 1 0 5 1 1 10 2 Performing a Conversion Conversions are initiated with a write operation to the control register Table 1 which selects the mux channel of the desired MAX197 U9 Channel 0 7 or U5 Channel 8 15 and configures the device mode Selecting ACQMOD 0 in the control register selects the internal acquisition mode This causes the write to the control register to initiate the acquisition interval whose duration is inter nally timed Conversion starts when this six clock cy2. Beg z SR a gt EE msp Ei JE NA nee 5 ee r TET oc T ug ene Re an n cz 59 Ray C52 M TH 5 as su 8 U EB een we ma 2 2 S85 Osis n 5 Sh en ES zis 2 5 a 8 jes a Zl SHS m ng RANE pple Fd 7 1 4 lt m m mmaa z one 2 l hal m ml m nn m EO mar Bil ee o eee ees85es8st oes 90 0 90 4 0 0 a eae Ree Ten eee Z u a ew a Re EL ca na oe Z MITITIITIT OC A LLTLTIL M POPE OOS COU i SU nho T i38 fe fa H i gt TYHCT 245 101101101 s TYHHCTEBE ER TYHCTESS SER 1100011001 ad TIT TTT KER JET TTT TET E a el o wu TT ink s u s 8 S F EE S SE EE eee O A A O A A 0 0 4 amp 4 0 0 8 T 0 08 6 4 9 4 0 0 0 0d ee ee 0 e S N Cle ee 0 0d 0 0 nal 0 0 o eee 0 0 6 Figure 2 MSI P442 card outline Page 5 MSI P442 User Manual B Card Addressing The card address is set by installing appropriate jumpers on JP1 pins 1 thru 24 as shown in Fig 3 An uninstalled jumper for a given address bit sets the bit to O false and an installed jumper sets the bitegualto 1 true Addresses A4 thru A15 are jumper selectable for defining the base address of the card from 0000H to FFFOH on integral 10H boundaries where H denotes a hexadecimal number To assign a base address of 3040H for example install jumpers JP1 A13 JP1 A12 and JP1 A6 Pins 25 thru 34 are u
3. Page 11 MSI P442 User Manual 6 Example BASIC Programs for MAX197 A D converters Program 1 A simple BASIC program that continually inputs thermocouple channels O thru 12 for the 5V unipolar mode and lists the results to the console is given below again BASEADDR 8H8000 insert jumper A15 of JP1 CBYTE 8H40 Control Byte for 5V Unipolar Mode FOR I 0 TO 7 process channels 0 7 OUT BASEADDR CBYTE I Write Control Byte WHILE INP BASEADDR 4 AND 1 1 WEND Test Status Bit 0 X INP BASEADDR Read LO Byte Y INP BASEADDR 1 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte Print CH 0 CH 3 Linefeed CH 4 CH 7 in hexadecimal format IF I 3 ORI 7 THEN PRINT HEX X ELSE PRINT HEX X NEXT I FOR I 0 TO 3 process channels 8 11 OUT BASEADDR 2 CBYTE I Write Control Byte WHILE INP BASEADDR 4 AND 2 2 WEND Test Status Bit 1 X INP BASEADDR 2 Read LO Byte Y INP BASEADDR 3 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte Print CH 8 CH 11 in hexadecimal format IF I 3 THEN PRINT HEX X ELSE PRINT HEX X NEXT I PRINT GOTO again Go Again END Program 2 A simple BASIC program that reads the analog inputs channels 12 thru 15 for unipolar and bipolar modes and lists the results to the console is given below BASEADDR 8H300 insert jumpers A8 and A9 of JP1 Control Byte for 5V Unipolar Mode
4. are conditioned by Analog Devices AD597 devices which provide built in ice point compensation with temperature proportional operation of 10 mV C in the temperature range of 200 C to 1000 C The analog inputs are single ended with an input impedance of 1IMOhms The analog output is provided by an Analog Devices AD5341 IC The card employs two Maxim MAX197 eight channel A D converters that provide inputs for the thermocouples 12 channels and analog inputs 4 channels Each incorporates a precision 2 5V reference source with buffer amp an internal 1 56 MHz clock and successive approximation and internal input track hold circuitry to convert the analog signal of each A4 Ai5 AD597 JUMPERS THERMOCOUPLE CONDITIONERS PC 104 INTERFACE CH 0 15 NETWORK INPUT BUFFER AMPLIFIERS FOR ANALOG IN 1 4 CONNECTOR PC 104 BUS INTERRUPT NETWORK PC 104 8 BIT STACKTHROUGH 34 PIN I O CONNECTOR AD5341 D A CONVERTER INTERRUPT JUMPERS MSI P442 Figure 1 Block Diagram of the MSI P442 Page 3 MSI P442 User Manual channel into a 12 bit digital signal Low span and offset errors result in no adjustments being reguired for these functions Typical total conversion times of 12 us gives a sample rate of 83 ksps for each group times of 12 us gives a sample rate of 83 ksps for each group of eight channels vielding rates up t
5. for Ch 12 OUT BASEADDR 2 amp H44 Write Control Byte WHILE INP BASEADDR 4 AND 2 2 WEND Test Status Bit 1 X INP BASEADDR 2 Read LO Byte Y INP BASEADDR 3 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte PRINT CH 12 PRINT HEX X Control Byte for 10V Unipolar Mode for Ch 13 OUT BASEADDR 2 amp H55 Write Control Byte WHILE INP BASEADDR 4 AND 2 2 WEND Test Status Bit 1 X INP BASEADDR 2 Read LO Byte Page 12 MSI P442 User Manual Y INP BASEADDR 3 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte PRINT CH 13 PRINT HEX X Control Byte for 5V Bipolar Mode for Ch 14 OUT BASEADDR 2 amp H4E Write Control Byte WHILE INP BASEADDR 4 AND 2 2 WEND Test Status Bit 1 X INP BASEADDR 2 Read LO Byte Y INP BASEADDR 3 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte PRINT CH 14 PRINT HEX X Control Byte for 10V Bipolar Mode for Ch 15 OUT BASEADDR 2 amp H5F Write Control Byte WHILE INP BASEADDR 4 AND 2 2 WEND Test Status Bit 1 X INP BASEADDR 2 Read LO Byte Y INP BASEADDR 3 Read HI Byte X X 256 Y AND amp HF Mask off 4 MSB s of HI Byte PRINT CH 15 PRINT HEX X END 7 Example C Program Sequence For a simple C program illustration using software polling of the device status consider a case with the following p
6. 1 converter time out error else converter_error 0 A D value inp base address ch group get converter value A D value A D value inp base address ch group 1 amp Oxf lt lt 8 return converter_error void main void Input channel 3 for 5V range and store if no time_out error if input A D 3 control byte 5 CH 3 INPUT A_D_value Input channel 9 for 10V range and store if no time out error if input A D 9 control byte 10B CH 9 INPUT A D value The function input A D int CHAN int C BYTE above is written in general terms to permit calls from the main routine or from other user defined functions by simply using the appropriate CHAN and C_BYTE values for the input channel desired and the desired input range Page 14 MSI P442 User Manual B Programming the AD5341 for Analog Output Performing an analog output is performed by write operations to the AD5341 as described below 1 Performing an Output Conversion An voltage output is performed by loading the Output Data Register with the desired 12 bit value followed by a dummy write output of any value to the Output Data Latch to transfer the data to the output The data register is loaded by performing byte writes to the lo byte and hi byte of the Output Data Register as given in Table 2 The data latch address is also in Table 2 2 Output Data Format The 12 bit value of te data register give
7. 2 13 874 3406 360 19 640 3601 14 712 3611 380 20 743 3800 15 552 3817 400 21 846 3999 16 395 4024 420 22 949 4198 17 241 4232 440 24 054 4398 18 088 4440 460 25 161 4598 18 938 4649 480 26 272 4798 19 788 4857 500 27 388 5000 20 640 5066 520 28 511 5203 21 493 5276 540 29 642 5407 22 346 5485 560 30 782 5613 23 198 5694 580 31 933 5821 24 050 5903 600 33 096 6031 24 902 6112 620 34 273 6243 25 751 6321 640 35 464 6458 26 599 6529 660 36 671 6676 27 445 6737 680 37 893 6897 28 288 6944 700 39 130 7120 29 128 7150 720 40 382 7346 29 965 7355 740 41 647 7575 30 799 7560 750 42 283 7689 31 214 7662 760 31 629 7764 780 32 455 7966 800 33 277 8168 820 34 095 8369 840 34 909 8569 860 35 718 8767 880 36 524 8965 900 37 325 9162 920 38 122 9357 940 38 915 9552 960 39 703 9745 980 40 488 9938 1000 41 269 10130 Page 17 MSI P442 User Manual PC 104 V SPECIFICATIONS 16 bit stackthrough Thermocouple and Analog Inputs T C Channels Analog Input Converter Thermocouple I F Analog Input Ranges Resolution Conversion Rate Non linearity Offset Error Gain Error Signal to Noise Input Resistance Internal Reference Ref Out Voltage Temp Coeff Analog Output Analog Outputs Converter Resolution Settling Time Ref Voltage In 12 4 MAXIM MAX197 Analog Devices AD597 K type 0 5V 0 10V 5V 10V Single ended 12 bits 82 ksps per 8 channels 1 2 LSB lt 0 5 of Spa
8. MSI P442 Rev 0 12 CHANNEL THERMOCOUPLE amp 12 BIT 4 CHANNEL A D amp 1 CHANNEL D A CARD USER MANUAL PC 104 Embedded Industrial Analog I O Series Microcomputer Systems Inc 1814 Ryder Drive Baton Rouge LA 70808 Ph 225 769 2154 Fax 225 769 2155 Email staff microcomputersystems com http www microcomputersystems com CONTENTS I INTRODUCTION 3 II HARDWARE DESCRIPTION 5 A Card Configuration B C A Card Addressing MAX197 A D Converters for Thermocouple and Analog Inputs Interrupt Connections for Thermocouple and Analoglnputs ObtainingaTemperature Reference for the Card AD5341 D A Converter for Analog Output ConnectingInputs and Output to 1 PROGRAMMING 9 Programming the MAX197 for Thermocouple and Analog Inputs Programming the AD5341 for Analog Output IV Temperature vs Thermocouple Input 16 Voltage Channels 0 thru 11 V SPECIFICATIONS 18 APPENDIX 19 Circuit Diagrams and Data Sheets I INTRODUCTION The MSI P442 is a low cost high performance card that provides twelve K type thermocouple inputs four 12 bit analog inputs and one 12 bit analog output designed for use with all PC 104 embedded systems Several models permit different combinations of these functions Software programmable analog input ranges are 0 5V 0 10V 5V and 10V with a linearity of 1 2 LSB The analog output range is 0 5V A block diagram of the card is shown in Figure 1 The thermocouple inputs
9. arameters and events 1 A base address for the card of 8000H insert jumper A15 of JP1 2 Read A D channel 3 input to U9 in the 5V unipolar mode and store the result in CH_3_INPUT 3 Read A D channel 9 input to U5 in the 10V bipolar mode and store the result in CH_9_INPUT A simple program sequence for this operation is Constant declarations define base_address 0x8000 card base address define control_byte_5 0x40 control byte for 5V range define control_byte_5B 0x48 control byte for 5V range define control byte 10 0x50 control byte for 10V range define control byte 10B 0x58 control byte for 10V range define delay_count 1000 delay count for converter time out Memory assignments int A_D_value CH_3_INPUT CH_9_INPUT Page 13 MSI P442 User Manual Routine to input A D channel CHAN 0 15 for control byte C BYTE and returns 0 on a converter time out error Stores converted value in A D value int input A D int CHAN int C BYTE int converter error a i ch group if 0 lt CHAN amp amp CHAN lt 8 ch group 0 else if 7 lt CHAN amp amp CHAN lt 16 ch group 2 CHAN CHAN 8 outp base_address ch_group C_BYTE CHAN write control byte if ch group lt 1 a 1 Ch 0 7 else a 2 Ch 8 15 i 0 do i while inp base_address 8 amp a amp amp i lt delay_count if i delay_count converter error
10. cle acquisition interval ends Writing a new control byte during the conversion cycle will abort the conversion and start a new acquisition interval 3 Reading the Data Register Conversions are complete when the appropriate status bit Table 1 becomes 0 following a write to the control register Channels 0 7 U9 are ready when bit O at address base 4 is 0 The data can now be read at the appropriate lo and hi byte addresses for the lo and hi bytes of the channel selected A2 A1 AO of the control register Channels 0 7 addresses base 0 and base 1 respectively are read Channels 8 15 U5 are ready when bit 1 at address base 4 is 0 The data can now be read at the appropriate lo and hi byte addresses for the lo and hi bytes of the channel selected A2 Al AO of the control register Channels 8 15 addresses base 2 and base 3 respectively are read 4 Input Data Format Unipolar Mode the output data format is binary In this Page 10 MSI P442 User Manual case 0 volts input yields OOOH where H denotes a hexadecimal number The value increases linearly from OOOH to FFFH with increasing input voltage A FS input full scale 5V or 10V ranges gives FFFH Bipolar Mode the output data format is twos complement binary In this case a FS input 5V or 10V ranges yields 800H The value increases linearly from 800H toward FFFH as the input voltage changes from FS toward 0 volts At O volts input in the ideal case the va
11. lue is OOOH Again the value increases linearly from 000H toward 7FFH as the input voltage changes from 0 toward FS volts The lo byte read bits DO thru D7 of the input data is the low byte BO thru B7 of the conversion result The hi byte read of the input data contains bits B8 thru B11 of the conversion result in bits DO thru D3 Bits D4 thru D7 contain all O s and all 1 s respectively for the unipolar and bipolar modes 5 Power Down Modes To save power the converters can be placed into a low power shutdown mode between conversions Two programmable power down modes are available Select STDBYPD or FULLPD by programming PDO and PD1 in the control register When software power down is asserted it becomes effective only after the end of conversion In both power down modes the interface remains active and conversion results may be read Input overvoltage protection is active The converter returns to normal operation on the first write to the control register In STDBYPD each device typically consumes 700UuA and in FULLPD 120 uA maximum The converter voltage reference remains active in STDBYPD This is a DC power state that does not degrade after power down of any duration and any sampling rate can be used without regard to start up delays In FULLPD however start up delays will effect the conversion Itis recommended when using this mode that a STDBYPD power down cycle be performed prior to starting conversions to allow the
12. n lt 0 5 of Span 70 dB min 1 MOhms Analog Input Channels 4 096 V 1 5 max 40 ppm C 1 Analog Devices AD5341 12 bits 10us 2 5V Connectors Model No Ji MSI P442 K 1 O Ji MSI P440 K T J1 MSI P440 K O J1 MSI P440 K One 1 30334 5502 or eg 34 pin One 1 30334 5502 or eg 34 pin One 1 30334 5502 or eg 34 pin One 1 30326 5502 or eg 26 pin J2 Analog out Models One 1 Molex 705530001 2 pin Optional Interrupts Channels Option Jumpers One sharing with tri state buffer for IRQ4 7 9 025 sguare posts 0 1 grid Electrical amp Environmental 5V 50 mA typical 40 to 85 C Page 18 MSI P442 User Manual APPENDIX Circuit Diagrams and Data Sheets See schematics P442 1 pdf and P442 2 pdf See data sheets MAX197 pdf and AD5341 pdf Page 19 MSI P442 User Manual
13. ns JP1 26 JP1 28 JP1 30 and JP1 32 INT OUT are connected and have the composite interrupt signal from the analog converters see circuit diagram in Appendix Any one of these can be jumpered to a single desired interrupt IR94 thru IRG9 of JP1 shown in Fig 3 This connection causes the interrupt selected to be activated when an end of conversion occurs from either analog converter The interrupt status can be checked to determine which converter interrupt is active as described in Section III 2 Pin JP1 32 1 KOhm pull down resistor is used to properly terminate the interrupt line selected in step 1 This pin should be jumpered to the interrupt line selected for only one card in the system E ObtainingaTemperature Reference for the Card A temperature reference can be obtained by shorting one of the thermocouple inputs atJ1 The resulting measurement for this input is the temperature of the AD597 of this channel F AD5341 D A Converter for Analog Output An AD5341 provides a 12 bit O 5V output voltage The device contains a 12 bit output data register O and an output data latch L The addresses of the output data register hi and lo bytes and the output data latch are given in Table 2 The Page 7 MSI P442 User Manual NOTE 1 A IRQ9 IS MIS LABELLED AS IRQ4 ON MSI P442 Rev 0 B IRQ7 IS MIS LABELLED AS IRO5 ON MSI P442 Rev 0 C IRQ5 IS MIS LABELLED AS IRQ7 ON MSI P442 Rev 0 Page 7A MSI P442 User Ma
14. nual operations of these registers are described in Section III Table 2 AD5341 Output Data Latch and Clear Addresses Output Data Register O Output Data Latch L base 6 lo base 8 base 7 hi G Connecting nputs and Output toj 1 Thermocouple inputs analog inputs and the analog output are interconnected to the card via J1 using a 34 pin flat cable connector Pin assignments are given in Table 3 Table 3 Connector Ji Inputs and Output Input J1 Pin Input J1 Pin T C 1 1 T C 10 19 T C 1 2 T C 10 20 T C 2 3 T C 11 21 T C 2 4 T C 11 22 T C 3 5 T C 12 23 T C 3 6 T C 12 24 T C 4 7 ANALOG IN 1 25 T C 4 8 GND 26 T C 5 9 ANALOG IN 2 27 T C5 10 GND 28 T C 6 11 ANALOG IN 3 29 T C 6 12 GND 30 T C 7 13 ANALOG IN 4 31 T C 7 14 GND 32 T C 8 15 ANALOG OUT 33 T C 8 16 GND 34 T C 9 17 T C 9 18 Optional connector J2 Molex 705530001 also provides ANALOG OUT Page 8 MSI P442 User Manual III PROGRAMMING A Programming the MAX197 for Thermocouple and Analog Inputs Performing data conversions involves a write operation to the control register of the appropriate MAX197 which selects the mux channel and configures the input mode The data is then read lo byte and hi byte when the conversion has been completed 1 Control Register Format The control register is an 8 bit write only register that selects the mux channel and mode of the converter The format is
15. o 166 ksps for 16 input channels An Analog Devices AD5341 provides the 12 bit 0 5V analog output signal The 2 5V reference voltage is supplied from one of the MAX197 devices The card is I O mapped using 16 bit addressing to select the input channels and device status Optionjumpers are provided by JP1 for specifying the card address A4 A15 and interrupt processing is provided for IRQ4 thru IRQ7 and IRQ9 using options jumpers as described in the next section Page 4 MSI P442 User Manual II HARDWARE DESCRIPTION A Card Configuration The MSI P442 card is a CMOS design using throush hole and surface mounted devices The card configuration is shown in Figure 2 and a circuit diagram of the network is given in the Appendix Connector J1 provides connections of the thermocouple input signals T C 1 thru T C 12 for ANALOG IN 1 thru ANALOG IN 4 input voltages and the ANALOG OUTPUT voltage Jumper block JP1 is used for address selection Pins 1 thru 24 and interrupt configuration Pins 25 thru 34 as described below Cie NE C13 u aon Ta cit Cel HE Cee 8 Jt c23 us EE cso E os es pa ceo me Zam ou R1 BER NE NE
16. oth J type and K type thermocouples the temperature is approximately given by Temperature C 100 x Vin in Volts The appropriate converter span 0 5V 5V 0 10V or 10V should to be chosen for the temperature range that is being monitored Table I Output Voltage vs Thermocouple Temperature Thermocouple Type J AD596 Type K AD597 Temperature Voltage Output Voltage Output oc mV mV mV mV 200 7 890 1370 5 891 1446 180 7 402 1282 5 550 1362 160 6 821 1177 5 141 1262 140 6 159 1058 4 669 1146 120 5 426 925 4 138 1016 100 4 632 782 3 553 872 80 3 785 629 2 920 717 60 2 892 468 2 243 551 40 1 960 299 1 527 375 20 995 125 777 191 10 501 36 392 96 o 0 54 0 o 10 507 146 397 97 20 1 019 238 798 196 25 1 277 285 1 000 245 30 1 536 332 1 203 295 40 2 058 426 1 611 395 50 2 585 521 2 022 496 60 3 115 617 2 436 598 80 4 186 810 3 266 802 100 5 268 1006 4 095 1005 120 6 359 1203 4 919 1207 140 7 457 1401 5 733 1407 160 8 560 1600 6 539 1605 180 9 667 1800 7 338 1801 Page 16 MSI P442 User Manual Table I Output Voltage vs Thermocouple Temperature Con t Thermocouple Type J AD596 Type K AD597 Temperature Voltage Output Voltage Output oc mV mV mV mV 200 10 777 2000 8 137 1997 220 11 887 2201 8 938 2194 240 12 998 2401 9 745 2392 260 14 108 2602 10 560 2592 280 15 217 2802 11 381 2794 300 16 325 3002 12 207 2996 320 17 432 3202 13 039 3201 340 18 537 340
17. s an output that changes linearly from OV for a value of OOOH to 5V for a value of FFFH where H denotes a hexadecimal number Bits 0 thru 7 of the lo byte are bits 0 thru 7 of the data register Bits 0 thru 3 of the hi byte are bits 8 thru 11 of the data register Bits 4 thru 7 of the hi byte are ignored The bit resolution for the output is 5V 4096 0 001221V or 1 221 mV Bit 3 Power on value of the AD5341 D A converter At power on the converter has an output value of 0 4 Example BASIC Program for AD5341 D A converter Program 1 A simple BASIC program that outputs a value entered from the keyboard to the converter BASEADDR 8H3000 insert jumpers A12 and A13 of JP1 again INPUT Enter decimal value to output X Y X AND 255 get 8 bits of lo byte X X Y 256 AND 15 get 4 bits of hi byte OUT BASEADDR 6 Y write lo byte OUT BASEADDR 7 X write hi byte OUT BASEADDR 8 0 write output latch to transfer data GOTO again END Page 15 MSI P442 User Manual IV Temperature vs Thermocouple Input Voltage Channels 0 thru 12 The temperature of a thermocouple input on any of channels O thru 7 is determined from the voltage that is read on its associated channel In the case of a K type thermocouple the voltage varies from 1446 mV to 10000 mV for temperatures of 200 C to 1000 C respectively Table 5 gives the temperature vs voltage outputs for both J type and K type thermocouples In the case of b
18. sed to configure the interrupt connections ifinterrupts are used as described in the Section II D C MAX197 A D Converters for Thermocouple and Analog Inputs The MAX197 converters each have two registers for performing data conversions a control output register C and an input data register I A third register implemented on the card for denoting interrupt status is called the status register S The addresses of the control input data C I and status for each channel are given in Table 1 The functions of the control the input data hi and lo bytes HE EB 555553 035002 02 2429 EEEE rar NA VW M0 U00 NI S AM 00 A S A S OO 00 NIN GN NI NI NI m m a3 o o o o o o o o o o o o o o o o o o o o o o o o o o o 25 DTS 29 31 33 IRQ9 2 IRO7 IRQ6 IRQS IRQ4 Figure 3 Jumper block JP1 configuration for base address and interrupt selection Page 6 MSI P442 User Manual and status registers are described in the Section III Table 1 MAX197 Analog Converters Control Register Addresses Channels Control Output C Data Input I Status S Bit 0 7 base 0 base 0 lo base 4 0 base 1 hi 8 15 base 2 base 2 lo base 4 1 base 3 hi D Interrupt Connections for Thermocouple and Analog Inputs See Note 1 on Page 7A Interrupt connections are implemented by pins 25 thru 34 of JP1 The steps in the procedure are as follows 1 Pi
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